Re: It all seems a bit far fetched, to me
How about a ginormous ball of sticky ballistics gel equivalent going in polar orbit. that way the orbit won't decay so quickly. kinetic energy remains the same after colliding, and "live" satellites can be steered out of its path. Anything NOT live gets to be part of the thing. launch it at an altitude that collides with most of the space junk.
it's as good as any other idea, and doesn't require propulsion, just enough time to stick to everything [like using tape on a suit to get the cat hair off]